Telephone call attachment.



PATENTED MAY 23, 1905. J. HARVESTON & J. O. MUDGETT. TELEPHONE CALL ATTACHMENT.

APPLICATION FILED DBO.16,190.

UNITED STATES Patented May 23, 1905.

PATENT OEEIcE.

TELEPHONE CALL ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 790,684, dated May 23, 1905.

Application filed December 16, 1904. Serial No. 237,076.

To (117 107mm may concern.

Be it known that we, Josnrn HAnvEs'roN and JOHN O. MUDeu'r'r, citizens of the United States, residing at Santa Cruz, in the county of Santa Cruz and State of California, have invented new and useful Improvements in Telephone Call Attachments, of which the following is a specification.

Our invention relates to a telephone call attachment especially adapted for use in central offices to make connection on party-lines.

It consists in a combination of mechanism and details of construction, which will be more fully explained by reference to the accompanying drawings, in which Figure l is a rear elevation of our device. Fig. 2 is a section on line 0 a; of Fig. 1.

1n telephone-lines and where there are several subscribers on a single party-line the calling of a particular number on that line is dependent upon the accuracy of the central operator, and the wrong numbers are often called, making considerable annoyance and delay.

It is the object of our invention to overcome this difliculty.

In the drawings we have shown a single device, which may represent a series. As shown in the drawings, A may be a panel of a switchboard under the control of an operator.

2 is a shaft extending parallel with the interior face of the panel, and this shaft may be continuously revolved by a small motor. The shaft may be corrugated or otherwise provided with a frictional surface sufiicient to rotate the part which may be brought into contact with it.

3 is a shaft parallel with the shaft 2. and having carried upon it a call-disk 4. This disk in the present case is shown with three teeth or protuberances upon its periphery or otherwise suitably carried by it, and this disk will represent the call for No. 3 of a partyline. Similar disks are carried to the shaft parallel with the disk 4, each having teeth 5 corresponding to the number to be called.

6 is a disk fixed to the toothed disk and having its periphery adapted to contact with the shaft 2, so as to be revolved thereby, and

when this disk is brought into contact with the revolving shaft it will be revolved, and with it the toothed disk 4:.

7 is a spring or equivalent arm having its free end in such position that when the disk a is revolved the teeth 5 will successively contact with this spring or arm. 8 is a wire connecting this arm with a source of electrical energy, and 9 is a wire completing the circuit from the shaft 3 through the call-bell or sounder, so that each time that the teeth 5 contact with the spring-arm the circuit will be completed and the bell will strike.

o have here shown the disk as having three sets of teeth 5, so that a single revolution of the disk will repeat the call three times, which is ordinarily sufficient; but any other grouping of the teeth may be made as may be desired.

The disk 6 has a notch or depression, as shown at 10, and this notch or depression normally stands contiguous to the revolving shaft 2, but out of contact therewith, so that the disk remains stationary. In order to bring the disk into position where it will be rotated by the shaft, we have shown a pin 11 projecting from the disk 6, and this is engagedby a notched lever 12, which in this case is shown as a bell-crank lever suitably fulcrumed with relation to the disk and pin 11, so that the notch in the lever normally engages the pin and retains the disk with the depression 10 in such position that the disk will not be rotated by the shaft 2. The lever is held in position by a spring 13, which presses against the other arm of the lever 12. Through the face of the switchboard or panel extends a rod having a press-button 14. upon its outer end, and the inner end is adapted to press against the opposite side of the spring-pressed arm of the lever 12. Vhenever a call is to be made for any particular number of a party-line, it is only necessary for the operator to press the button 14. This will tilt the lever 12 and will turn the disk 6 sufliciently, so that its periphery will be engaged by the revoluble shaft, and it will then be revolved until the depression 10 again coincides with the shaft 2, when it will stop. During this revolution of the disk 6, which carries also the disk 4, the teeth 5 upon the disk 4 will make contact with the spring or arm 7 and through it will complete the electrical circuit, as previously described. Thus the pressure of any button will actuate the disk which it controls, and the call with the particular number desired will be accurately made.

Having thusdescribed our invention, what we claim, and desire to secure by Letters Patent, isf

1. Atelephone callattachment consisting of a revolubly-mounted toothed disk, connections by which an electrical circuit is intermittently completed by the contact of the teeth, a second disk revoluble in unison with the toothed disk, said disk having a depression in its periphery, a revoluble shaft with which the depression is normally coincident, and means including a push member, a bell-crank lever actuated thereby, and a pin on the second disk engaged by said lever, for turning the second disk so that its periphery will contact with the revoluble shaft and complete a revolution of itself in the toothed disk.

2. In atelephone call attachment, a revolubly-moun ted disk having teeth upon its periphery corresponding with the number of the call, an arm with which said teeth contact and by which an electrical circuit is completed, a sec ond disk revoluble in unison with the toothed disk and having a depression or notch in its periphery, a continually-revolving shaft with which said depression is normally coincident, a pin projecting from the second disk, a spring-pressed bell-crank lever having a notch in one arm engaging the pin, a press-button engaging the other arm and adapted to tilt it and turn the disk so that its periphery contacts with the revolving shaft, said lever being returned upon the release of the pressbutton and forming a stop for the disk when a revolution has been completed and the depression again-coincides with the revolving shaft.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

JOSEPH HARVESTON. JOHN O. MUDGETT.

Witnesses:

S. H. NOURSE, HENRY P. TRICOU. 

